Safety device for paper cutters



Nov. 20, 1934. A. T. MOYER 1,981,063

SAFETY DEVICE FOR PAPER CUTTERS Filed Dec. 15, 1955 2 Shets-Sheet 1 fidrearf er Nov. 20, 1934. MQYER SAFETY DEVICE FOR PAPER CUTTERS Filed Dec. 15, 1933 2 Sheets-Sheet 2 yer Patented Nov. 20, 1934 SAFETY DEVICE FOR PAPER CUTTERS Andrew T. Moyer, Jenkintown, Pa.

Application December 15, 1933, Serial No. 702,469

4 Claims.

My invention relates to new and useful improvements in a safety device for paper cutters and the like and more particularly to improvements on my Patent No. 1,749,296 dated March 4,

One of the objects of the present invention is to provide an attachment which can be applied to a machine wherein the knife carrier has a longitudinal oscillating motion as well as an up and down reciprocating motion and to utilize the movements of the knife carrier for imparting an in and out vibratory movement to a buffer bar that will force the hands of an operator out of the danger zone while the knife is descending.

Another object of this invention is to provide a safety device which will protect a machine operator from accidents wherein a buffer bar is mounted for vibratory movement, said buffer bar being so moved through mechanism connected with a knife carrier that operates in a way to impart a shearing action to a knife attached to the carrier.

A further object of the invention is to generally improve and simplify the construction of devices of this kind in making a rugged structure which will withstand hard usage.

With these and other ends in view, this invention consists in the details of construction and combination of elements hereinafter set forth and then specifically designated by the claims.

In order that persons skilled in the art to which this invention appertains, may understand how to make and use the same, I will describe its construction in detail, referring by numerals to the accompanying drawings forming a part of this application, in which;

Fig. 1 is a fragmentary and broken front elevation of a paper cutting machine showing my improved safety device assembled thereon.

Fig. 2 is a section on the line 2-2 of Fig. 1, with the forked lever left in elevation. I

Fig. 3 is a horizontal transverse sectional view on the line 3-3 of Fig. 2.

Fig. 4 is an enlarged section of one of the buffer bar guides and associated wheeled support for said buffer bar, and

Fig. 5 is an enlarged plan view of one of the wheeled supports.

In carrying out my invention as herein embodied, 10 represents a paper cutting machine of usual or well known construction including a knife carrier 11, adapted to reciprocate or move up and down relative to the machine table 12, and also to oscillate or move longitudinally of itself or transversely relative to the machine togive a shearing action to the knife.

For the purpose of illustration brackets 13,.are shown as secured to side plates 14 and said brackets support buffer bar guides 15, one at each side of the machine. Said guides project rearwardly from the front of the machine in inclined positions.

A buffer bar 16 extends across the machine between the guides 15 andhas itsends attached to the arms 17 of the Wheeled supports 18, the latter being mounted on wheels or rollers 19 which fit in the trackways 20 of the guides 15. As the buffer bar is moved forward and backward it will descend and ascend respectively relative to the machine table.

On the back of the buffer 16 are ears 21 to which arepivoted ends of the connecting bars or, links 22 and said links are also pivoted to the lower arms 23 "of the bell crank levers 2a. The bell crank levers are mounted on a rod 25 havingits ends supported by brackets 26 carried byany suitable part of the machine frame.

The bell crank 1evers24 have the. ends of their upper arms 27 pivotally connected with the arms 28 and 29 of the forked lever. 30 which is pivoted at 31 to the carriage 32.

The carriage 32 coacts with the outer face of the angular guide 33 and is provided with a wheel or roller 34 that runs in the track 35. Said guide 33 is V-shaped to provide two inclined portions extending upwardly from a point approximately midway the length thereof and is fastened to the knife carrier 11 by attaching means 36 which pass through feet 37 and 38 on the ends of the guide.

The knife carrier has a downward and sidewise movement to impart a cutting and shearing action to the knife and during the first part of the movement, the safety device is actuated with considerable speed because of the inclined arrangement of the left-hand arm of the guide 33. When the carriage 32 reaches the junction between the two arms of said guide, the buffer bar 16 will have reached its fully extended position which occurs prior to the knife completing its downward stroke. The buffer bar now remains in its fully extended position while the knife continues to move downward and sidewise and this is possible due to the angularity of the righthand arm of said guide 33, the inclination and length of which compensate for the final movements of the knife carrier.

The foot 38 is of greater length than the foot 37 whereby the guide is at an angle bodily to the front face of the knife carrier in order to accommodate the movements of the inner end of the forked lever 30 as its angular position changes due to operation of the mechanism. In other Words, as the knife carrier moves downward, the pivoted connection between the forked lever 30 and the carriage 32 moves away from the knife carrier 11, due to the changing angular position of said forked lever, and the length of the foot 38 is equal to the outward movement of the pivot point 31 so as to compensate for said movement.

Each time the knife carrier functions and moves downward and to one side of the machine the wheeled carriage 32 will be depressed and the guide 33 will bepermitted to travel with the knife carrier while imparting the depressing movement to said wheeled carriage. The descent of the carriage will cause the forked lever to actuate the bell crank levers 24 which through the medium of the links 22 will project the buffer bar I 16 forward.

As the buffer bar moves forward it is guided downward so as to push the arms and hands of the machine operator away from the knife and thereby prevent accidents or injury to the operator. When the buffer bar is moved rearward by the reverse operation of the knife carrier, said buffer bar is elevated sufficiently to dispose it out of the path of any work being placed in the machine.

Of course I do not wish to be limited to the exact details of construction shown and described herein, as they may be varied within the limits of the appended claims without departing from pivoted bell crank levers having portions pivotally connected with the arms of the forked lever, and links pivoted to the bell crank levers and the buffer bar.

2. In a paper cutting machine including a frame and a knife carrier functioning to impart a shearing action to a. knife mounted thereon, a guide attached to said knife carrier, a rod supported by the machine frame, bell crank levers mounted on saidrod, a forkedlever having each arm pivotally connected to one arm of each bell crank lever, a wheeled carriage pivoted to the forked lever and operating in the guide whereby movements of the knife carrier will impart motion to the bell crank levers, a buffer bar, links connected to said buffer bar and the other arms of the bell crank levers for transmitting motion to said buffer bar, and means to guide said buffer bar. I

3. The structure set forth in claim 2, wherein wheeled supports are provided between the buffer knife mounted thereon, a V-shaped guide attached to: said knife carrier, a wheeled carriage mounted in said guide, a forked lever having a lug by which it is pivoted to said carriage, a rod supported by the machine frame forward of the guide, bell crank levers mounted .on said rod and each having one of its. arms pivotally connected to one of the arms of the forked lever, brackets supported by the machine frame, buffer bar guides secured to said brackets, wheeled supports mounted to run in the last named guides, a buffer bar carried by said wheeled supports, and links pivoted to the other arms of the bell crank levers and to said buffer bar whereby the oscillating and reciprocating motions of the knife carrier will cause the buffer bar to move to and fro.

. ANDREW T. MOYER. 

